Units and conversions


Within this section, you can find commonly used units (with conversions from one unit to another) for thermal expansion and density. Fortunately, only a few units are in common use so the content is brief.


The SI unit for density is kilograms per cubic-metre (kg/m3). Another unit commonly used for solid materials is grams per cubic-centimetre (g/cm3). Rarely used units include grams per litre (g/l) and grams per decilitre (g/dl). Conversion between these units is straightforward:

1 kg/m3 = 1 kg/dm3 = 1 kg/l   or  1 g/cm3 = 1 g/ml

As a reference value, the density of water (1000 kg/m3=1 g/cm3) at 3.98 C and at a pressure of 1013,25 hPa, is often used. For solid materials, densities are most commonly reported in g/cm3 at 20 C, whereas for gases values are often presented in g/l at 0 C (at standard ambient pressure).

Thermal Expansion

The SI unit for thermal expansivity is per Kelvin, K-1, or per degree Celsius, C-1.